from pathlib import Path

from app.dependencies import DependencyManager
from app.paths import AppPaths
from app.ui import ConsoleUI
from app.venv_manager import VirtualEnvManager


class AppRunner:
    def __init__(self, base_dir: Path, entry_script: Path) -> None:
        self.paths = AppPaths(base_dir=base_dir)
        self.entry_script = entry_script

    def _bootstrap(self) -> None:
        """Ensure venv and dependencies are ready (re-execs into venv if needed)."""
        venv = VirtualEnvManager(self.paths.venv_dir, self.entry_script)
        if not venv.in_virtualenv():
            ConsoleUI.info("Virtuelle Umgebung wird vorbereitet...")
        venv.ensure_and_reexec_if_needed()

        deps = DependencyManager(self.paths.requirements_path)
        missing = deps.install_missing()
        if missing:
            ConsoleUI.success(f"Abhaengigkeiten installiert: {', '.join(missing)}")
        else:
            ConsoleUI.info("Alle Abhaengigkeiten sind bereits installiert.")

    def setup(self) -> None:
        ConsoleUI.headline("BackItUp Setup")
        self._bootstrap()
        ConsoleUI.success("System ist bereit.")
        self._install_systemd_service()

    def _install_systemd_service(self) -> None:
        import shutil
        import subprocess

        if not shutil.which("systemctl"):
            ConsoleUI.warn("systemctl nicht gefunden – kein systemd-System erkannt.")
            ConsoleUI.info("Manuelle Installation: bash scripts/service.sh install")
            return

        service_name = "BackItUp.service"
        user_systemd_dir = Path.home() / ".config" / "systemd" / "user"
        user_systemd_dir.mkdir(parents=True, exist_ok=True)

        if self.paths.venv_dir.name == "nt":
            venv_python = self.paths.venv_dir / "Scripts" / "python.exe"
        else:
            venv_python = self.paths.venv_dir / "bin" / "python"

        service_content = f"""[Unit]
Description=BackItUp Flask Service
After=network-online.target
Wants=network-online.target

[Service]
Type=simple
WorkingDirectory={self.paths.base_dir}
ExecStart={venv_python} {self.entry_script.resolve()}
Restart=on-failure
RestartSec=3
Environment=PYTHONUNBUFFERED=1

[Install]
WantedBy=default.target
"""

        target = user_systemd_dir / service_name
        target.write_text(service_content)
        ConsoleUI.success(f"Service-Datei geschrieben: {target}")

        try:
            subprocess.run(["systemctl", "--user", "daemon-reload"], check=True)
            ConsoleUI.success("systemd daemon neu geladen.")
        except subprocess.CalledProcessError as exc:
            ConsoleUI.warn(f"daemon-reload fehlgeschlagen: {exc}")

        ConsoleUI.info(f"Service aktivieren:  systemctl --user enable {service_name}")
        ConsoleUI.info(f"Service starten:     systemctl --user start  {service_name}")
        ConsoleUI.info(f"Status pruefen:      systemctl --user status {service_name}")
        ConsoleUI.info(f"Logs verfolgen:      journalctl --user -u {service_name} -f")

    def run(self) -> None:
        ConsoleUI.headline("BackItUp Bootstrap")
        self._bootstrap()

        from app.config_store import ConfigStore
        from app.setup_wizard import SetupWizard
        from app.web_server import FlaskServer

        store = ConfigStore(self.paths.db_path)
        store.ensure_schema()

        config = store.load_config()
        if config is None:
            ConsoleUI.warn("Keine vollstaendige Konfiguration gefunden.")
            setup_data = SetupWizard().collect_initial()
            store.save_config(setup_data.config)
            store.create_user(
                setup_data.admin_username,
                setup_data.admin_password_hash,
                is_admin=True,
            )
            config = setup_data.config
            ConsoleUI.success("Konfiguration und Admin-Benutzer wurden gespeichert.")
        elif not store.has_any_user():
            ConsoleUI.warn("Keine Benutzer gefunden.")
            admin_username, admin_hash = SetupWizard().collect_admin_user()
            store.create_user(admin_username, admin_hash, is_admin=True)
            ConsoleUI.success("Admin-Benutzer wurde gespeichert.")

        ConsoleUI.success("System ist bereit.")
        ConsoleUI.info(
            f"Flask startet auf http://{config.ip}:{config.port} (debug={config.debug})"
        )
        FlaskServer(config=config, store=store).run()